1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -basic-aa -dse -enable-dse-memoryssa -S | FileCheck %s
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
declare void @llvm.memset.p0i8.i64(i8* nocapture, i8, i64, i32, i1) nounwind
define void @test13(i32* noalias %P) {
; CHECK-LABEL: @test13(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR:%.*]]
; CHECK: for:
; CHECK-NEXT: store i32 0, i32* [[P:%.*]]
; CHECK-NEXT: br i1 false, label [[FOR]], label [[END:%.*]]
; CHECK: end:
; CHECK-NEXT: ret void
;
entry:
br label %for
for:
store i32 0, i32* %P
br i1 false, label %for, label %end
end:
ret void
}
define void @test14(i32* noalias %P) {
; CHECK-LABEL: @test14(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR:%.*]]
; CHECK: for:
; CHECK-NEXT: store i32 0, i32* [[P:%.*]]
; CHECK-NEXT: br i1 false, label [[FOR]], label [[END:%.*]]
; CHECK: end:
; CHECK-NEXT: ret void
;
entry:
store i32 1, i32* %P
br label %for
for:
store i32 0, i32* %P
br i1 false, label %for, label %end
end:
ret void
}
define void @test18(i32* noalias %P) {
; CHECK-LABEL: @test18(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[P2:%.*]] = bitcast i32* [[P:%.*]] to i8*
; CHECK-NEXT: store i32 0, i32* [[P]]
; CHECK-NEXT: br label [[FOR:%.*]]
; CHECK: for:
; CHECK-NEXT: store i8 1, i8* [[P2]]
; CHECK-NEXT: [[X:%.*]] = load i32, i32* [[P]]
; CHECK-NEXT: store i8 2, i8* [[P2]]
; CHECK-NEXT: br i1 false, label [[FOR]], label [[END:%.*]]
; CHECK: end:
; CHECK-NEXT: ret void
;
entry:
%P2 = bitcast i32* %P to i8*
store i32 0, i32* %P
br label %for
for:
store i8 1, i8* %P2
%x = load i32, i32* %P
store i8 2, i8* %P2
br i1 false, label %for, label %end
end:
ret void
}
define void @test21(i32* noalias %P) {
; CHECK-LABEL: @test21(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[ARRAYIDX0:%.*]] = getelementptr inbounds i32, i32* [[P:%.*]], i64 1
; CHECK-NEXT: [[P3:%.*]] = bitcast i32* [[ARRAYIDX0]] to i8*
; CHECK-NEXT: [[TMP0:%.*]] = getelementptr inbounds i8, i8* [[P3]], i64 4
; CHECK-NEXT: call void @llvm.memset.p0i8.i64(i8* align 4 [[TMP0]], i8 0, i64 24, i1 false)
; CHECK-NEXT: br label [[FOR:%.*]]
; CHECK: for:
; CHECK-NEXT: [[ARRAYIDX1:%.*]] = getelementptr inbounds i32, i32* [[P]], i64 1
; CHECK-NEXT: store i32 1, i32* [[ARRAYIDX1]], align 4
; CHECK-NEXT: br i1 false, label [[FOR]], label [[END:%.*]]
; CHECK: end:
; CHECK-NEXT: ret void
;
entry:
%arrayidx0 = getelementptr inbounds i32, i32* %P, i64 1
%p3 = bitcast i32* %arrayidx0 to i8*
call void @llvm.memset.p0i8.i64(i8* %p3, i8 0, i64 28, i32 4, i1 false)
br label %for
for:
%arrayidx1 = getelementptr inbounds i32, i32* %P, i64 1
store i32 1, i32* %arrayidx1, align 4
br i1 false, label %for, label %end
end:
ret void
}
define void @test_loop(i32 %N, i32* noalias nocapture readonly %A, i32* noalias nocapture readonly %x, i32* noalias nocapture %b) local_unnamed_addr {
; CHECK-LABEL: @test_loop(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[CMP27:%.*]] = icmp sgt i32 [[N:%.*]], 0
; CHECK-NEXT: br i1 [[CMP27]], label [[FOR_BODY4_LR_PH_PREHEADER:%.*]], label [[FOR_COND_CLEANUP:%.*]]
; CHECK: for.body4.lr.ph.preheader:
; CHECK-NEXT: br label [[FOR_BODY4_LR_PH:%.*]]
; CHECK: for.cond.cleanup:
; CHECK-NEXT: ret void
; CHECK: for.body4.lr.ph:
; CHECK-NEXT: [[I_028:%.*]] = phi i32 [ [[INC11:%.*]], [[FOR_COND_CLEANUP3:%.*]] ], [ 0, [[FOR_BODY4_LR_PH_PREHEADER]] ]
; CHECK-NEXT: [[ARRAYIDX:%.*]] = getelementptr inbounds i32, i32* [[B:%.*]], i32 [[I_028]]
; CHECK-NEXT: [[MUL:%.*]] = mul nsw i32 [[I_028]], [[N]]
; CHECK-NEXT: br label [[FOR_BODY4:%.*]]
; CHECK: for.body4:
; CHECK-NEXT: [[TMP0:%.*]] = phi i32 [ 0, [[FOR_BODY4_LR_PH]] ], [ [[ADD9:%.*]], [[FOR_BODY4]] ]
; CHECK-NEXT: [[J_026:%.*]] = phi i32 [ 0, [[FOR_BODY4_LR_PH]] ], [ [[INC:%.*]], [[FOR_BODY4]] ]
; CHECK-NEXT: [[ADD:%.*]] = add nsw i32 [[J_026]], [[MUL]]
; CHECK-NEXT: [[ARRAYIDX5:%.*]] = getelementptr inbounds i32, i32* [[A:%.*]], i32 [[ADD]]
; CHECK-NEXT: [[TMP1:%.*]] = load i32, i32* [[ARRAYIDX5]], align 4
; CHECK-NEXT: [[ARRAYIDX6:%.*]] = getelementptr inbounds i32, i32* [[X:%.*]], i32 [[J_026]]
; CHECK-NEXT: [[TMP2:%.*]] = load i32, i32* [[ARRAYIDX6]], align 4
; CHECK-NEXT: [[MUL7:%.*]] = mul nsw i32 [[TMP2]], [[TMP1]]
; CHECK-NEXT: [[ADD9]] = add nsw i32 [[MUL7]], [[TMP0]]
; CHECK-NEXT: [[INC]] = add nuw nsw i32 [[J_026]], 1
; CHECK-NEXT: [[EXITCOND:%.*]] = icmp eq i32 [[INC]], [[N]]
; CHECK-NEXT: br i1 [[EXITCOND]], label [[FOR_COND_CLEANUP3]], label [[FOR_BODY4]]
; CHECK: for.cond.cleanup3:
; CHECK-NEXT: store i32 [[ADD9]], i32* [[ARRAYIDX]], align 4
; CHECK-NEXT: [[INC11]] = add nuw nsw i32 [[I_028]], 1
; CHECK-NEXT: [[EXITCOND29:%.*]] = icmp eq i32 [[INC11]], [[N]]
; CHECK-NEXT: br i1 [[EXITCOND29]], label [[FOR_COND_CLEANUP]], label [[FOR_BODY4_LR_PH]]
;
entry:
%cmp27 = icmp sgt i32 %N, 0
br i1 %cmp27, label %for.body4.lr.ph.preheader, label %for.cond.cleanup
for.body4.lr.ph.preheader: ; preds = %entry
br label %for.body4.lr.ph
for.cond.cleanup: ; preds = %for.cond.cleanup3, %entry
ret void
for.body4.lr.ph: ; preds = %for.body4.lr.ph.preheader, %for.cond.cleanup3
%i.028 = phi i32 [ %inc11, %for.cond.cleanup3 ], [ 0, %for.body4.lr.ph.preheader ]
%arrayidx = getelementptr inbounds i32, i32* %b, i32 %i.028
store i32 0, i32* %arrayidx, align 4
%mul = mul nsw i32 %i.028, %N
br label %for.body4
for.body4: ; preds = %for.body4, %for.body4.lr.ph
%0 = phi i32 [ 0, %for.body4.lr.ph ], [ %add9, %for.body4 ]
%j.026 = phi i32 [ 0, %for.body4.lr.ph ], [ %inc, %for.body4 ]
%add = add nsw i32 %j.026, %mul
%arrayidx5 = getelementptr inbounds i32, i32* %A, i32 %add
%1 = load i32, i32* %arrayidx5, align 4
%arrayidx6 = getelementptr inbounds i32, i32* %x, i32 %j.026
%2 = load i32, i32* %arrayidx6, align 4
%mul7 = mul nsw i32 %2, %1
%add9 = add nsw i32 %mul7, %0
%inc = add nuw nsw i32 %j.026, 1
%exitcond = icmp eq i32 %inc, %N
br i1 %exitcond, label %for.cond.cleanup3, label %for.body4
for.cond.cleanup3: ; preds = %for.body4
store i32 %add9, i32* %arrayidx, align 4
%inc11 = add nuw nsw i32 %i.028, 1
%exitcond29 = icmp eq i32 %inc11, %N
br i1 %exitcond29, label %for.cond.cleanup, label %for.body4.lr.ph
}
declare i1 @cond() readnone
; TODO: We can eliminate the store in for.header, but we currently hit a MemoryPhi.
define void @loop_multiple_def_uses(i32* noalias %P) {
; CHECK-LABEL: @loop_multiple_def_uses(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_HEADER:%.*]]
; CHECK: for.header:
; CHECK-NEXT: store i32 1, i32* [[P:%.*]], align 4
; CHECK-NEXT: [[C1:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[C1]], label [[FOR_BODY:%.*]], label [[END:%.*]]
; CHECK: for.body:
; CHECK-NEXT: store i32 1, i32* [[P]], align 4
; CHECK-NEXT: [[LV:%.*]] = load i32, i32* [[P]]
; CHECK-NEXT: br label [[FOR_HEADER]]
; CHECK: end:
; CHECK-NEXT: store i32 3, i32* [[P]], align 4
; CHECK-NEXT: ret void
;
entry:
br label %for.header
for.header:
store i32 1, i32* %P, align 4
%c1 = call i1 @cond()
br i1 %c1, label %for.body, label %end
for.body:
store i32 1, i32* %P, align 4
%lv = load i32, i32* %P
br label %for.header
end:
store i32 3, i32* %P, align 4
ret void
}
; We cannot eliminate the store in for.header, as it is only partially
; overwritten in for.body and read afterwards.
define void @loop_multiple_def_uses_partial_write(i32* noalias %p) {
; CHECK-LABEL: @loop_multiple_def_uses_partial_write(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_HEADER:%.*]]
; CHECK: for.header:
; CHECK-NEXT: store i32 1239491, i32* [[P:%.*]], align 4
; CHECK-NEXT: [[C1:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[C1]], label [[FOR_BODY:%.*]], label [[END:%.*]]
; CHECK: for.body:
; CHECK-NEXT: [[C:%.*]] = bitcast i32* [[P]] to i8*
; CHECK-NEXT: store i8 1, i8* [[C]], align 4
; CHECK-NEXT: [[LV:%.*]] = load i32, i32* [[P]]
; CHECK-NEXT: br label [[FOR_HEADER]]
; CHECK: end:
; CHECK-NEXT: store i32 3, i32* [[P]], align 4
; CHECK-NEXT: ret void
;
entry:
br label %for.header
for.header:
store i32 1239491, i32* %p, align 4
%c1 = call i1 @cond()
br i1 %c1, label %for.body, label %end
for.body:
%c = bitcast i32* %p to i8*
store i8 1, i8* %c, align 4
%lv = load i32, i32* %p
br label %for.header
end:
store i32 3, i32* %p, align 4
ret void
}
; We cannot eliminate the store in for.header, as the location is not overwritten
; in for.body and read afterwards.
define void @loop_multiple_def_uses_mayalias_write(i32* %p, i32* %q) {
; CHECK-LABEL: @loop_multiple_def_uses_mayalias_write(
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[FOR_HEADER:%.*]]
; CHECK: for.header:
; CHECK-NEXT: store i32 1239491, i32* [[P:%.*]], align 4
; CHECK-NEXT: [[C1:%.*]] = call i1 @cond()
; CHECK-NEXT: br i1 [[C1]], label [[FOR_BODY:%.*]], label [[END:%.*]]
; CHECK: for.body:
; CHECK-NEXT: store i32 1, i32* [[Q:%.*]], align 4
; CHECK-NEXT: [[LV:%.*]] = load i32, i32* [[P]]
; CHECK-NEXT: br label [[FOR_HEADER]]
; CHECK: end:
; CHECK-NEXT: store i32 3, i32* [[P]], align 4
; CHECK-NEXT: ret void
;
entry:
br label %for.header
for.header:
store i32 1239491, i32* %p, align 4
%c1 = call i1 @cond()
br i1 %c1, label %for.body, label %end
for.body:
store i32 1, i32* %q, align 4
%lv = load i32, i32* %p
br label %for.header
end:
store i32 3, i32* %p, align 4
ret void
}
%struct.hoge = type { i32, i32 }
@global = external local_unnamed_addr global %struct.hoge*, align 8
define void @widget(i8* %tmp) {
; CHECK-LABEL: @widget(
; CHECK-NEXT: bb:
; CHECK-NEXT: call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 [[TMP:%.*]], i8* nonnull align 16 undef, i64 64, i1 false)
; CHECK-NEXT: br label [[BB1:%.*]]
; CHECK: bb1:
; CHECK-NEXT: [[TMP2:%.*]] = load %struct.hoge*, %struct.hoge** @global, align 8
; CHECK-NEXT: [[TMP3:%.*]] = getelementptr inbounds [[STRUCT_HOGE:%.*]], %struct.hoge* [[TMP2]], i64 undef, i32 1
; CHECK-NEXT: store i32 0, i32* [[TMP3]], align 4
; CHECK-NEXT: [[TMP4:%.*]] = load %struct.hoge*, %struct.hoge** @global, align 8
; CHECK-NEXT: [[TMP5:%.*]] = getelementptr inbounds [[STRUCT_HOGE]], %struct.hoge* [[TMP4]], i64 undef, i32 1
; CHECK-NEXT: store i32 10, i32* [[TMP5]], align 4
; CHECK-NEXT: br label [[BB1]]
;
bb:
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 1 %tmp, i8* nonnull align 16 undef, i64 64, i1 false)
br label %bb1
bb1: ; preds = %bb1, %bb
%tmp2 = load %struct.hoge*, %struct.hoge** @global, align 8
%tmp3 = getelementptr inbounds %struct.hoge, %struct.hoge* %tmp2, i64 undef, i32 1
store i32 0, i32* %tmp3, align 4
%tmp4 = load %struct.hoge*, %struct.hoge** @global, align 8
%tmp5 = getelementptr inbounds %struct.hoge, %struct.hoge* %tmp4, i64 undef, i32 1
store i32 10, i32* %tmp5, align 4
br label %bb1
}
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* noalias nocapture writeonly, i8* noalias nocapture readonly, i64, i1 immarg)
|
